Supporting-frame for incandescent lamps with metal filaments.



L. G'LASER. SUPPORTING FRAME FOR INGANDESOENT LAMPS WITH METALFILAMENTS.

APPLICATION FILED MAR.13, 1907.

1,01 1,771. Patented De0.12,1911.

Witnesses: Inventor:

LUdwig'Glaser 9 i AJ/4M- fibf UNITED STATES PATENT OFFICE.

LUDWIG GLASER, OF BERLIN, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COMPANY,

A CORPORATION OF NEW YORK.

SUPPORTING-FRAME FOR INCANDESCENT LAMPS WITH METAL FILAMENTS.

Specification of Letters Patent.

Patented I)ec. .12, 1911.

Application filed March 13, 1907. Serial No; 362,135.

To all whom it may concern:

3e it known that T, LUDWIG GLASER, a subject of the Grand Duke ofSaxe-Coburg- Gotha, residing at Berlin, Germany, have invented certainnew and useful Improvements in SupportingFrames for Incandescent Lampswith Metal Filaments, of which the following is a specification.

Incandescent lamps with filaments of high fusion metals are usuallyfurnished with a special supporting frame having one or more groups ofholders for supporting the separate filaments in the interior of thelamp. This frame is intended to prevent contact of the filaments witheach other and to hold the filaments securely in place .so that theywill not break from shocks or oscillations during transportation. The

frame also serves to permit operation of. v

6 sealed therein, each carrying at its outer the lamps in any position,even though the filaments of the lamps. are'softwhile in a hotcondition.

Since the temperature ofthe incandescent metal filament is very high,the holders or supports (loops or eyes) through which the arms of thefilaments are led, must be made of a high fusing material, for example,thorium oxid, magnesia, etc. The loops are connected withthe supportingframe, either rigidly or flexibly, by any desired connecting means. Inorder to di minish the number of connecting means, each group usuallycontains as many holders as there are looped filaments, so that one armof the filament is held by means of a support, while the other arm isfree. In the burning of such a lamp the disadvantage frequently arisesthat the free arm of the incandescent filament comes in contact with themore fusible parts of the supporting frame, made commonly of glass, orwith the connections between the supporting frame and the holder. Achemical or mechanical effect may be produced by this contact. Generallythe filament adheres, resulting in a broken filament when the lamp iscut out of circuit.

The object of the present invention is a supporting frame by means'ofwhich the above-mentioned While the separate holders have been, up tothe present time, placed in a substantially radial position, they are,according to this invention, so placed or so formed that theydifficulties are avoided,

occupy a. substantially tangential position, or at least so that partsof them occupy such position. Thus the holders of each group are closedupon themselves in a ring, and completely prevent the freely movablefila merit arms located outside from coming in contact with the morefusible parts of the supporting frame.

Figure 1 illustrates a supporting frame having four filaments, with twogroups of holders; Fig. 2 shows the upper group of holders, seen fromabove; and Fig. 3 shows a support formed of a single piece, as viewedfrom above.

The usual lamp stem 1 is provided with a glass rod or pedestal 2carrying disk-shaped enlargements 3, 4: and 5 to which the filaments aresecured. Disk 5 at the end of the pedestal has four short pieces of wireend a glass head 7. Refractory holders 8 are fused'to the glass beadsand are located in a substantially tangential manner so that the loop 9of each holder is contiguous to the head of the next holder The loopedvpart of each holder secures one leg of a fila- 'ment in position and thestraight or tangential part of that holder prevents the free leg ofanother filament from coming in contact with the glass pedestal, itsenlargements, or the pieces of wire 6, and beads of glass 7. The holdersgrouped about disk 5 each embrace one leg of each of the filaments 10,and the holders grouped about disk 4- engage the other legs of thesefilaments.

The form or embodiment shown can be varied in many ways withoutdeparting from the spirit pf my invention. It is possible also toreplace each holder-group by a shaped member made of refractorymaterial, such as thorium oXid, stampcdoo pressed out at one operation.This'form' (f holder is illustrated by Fig. 3. which shows a disk'-''contact of the filaments with parts of the supporting frame other thansaid holders.

3. In an incandescent lamp, the combination of a plurality of filamentloops and a refractory holder engaging with one leg of a filament loopand limiting the movement of the next filament loop.

a. In an incandescent electric lamp, the combination of a plurality offilament loops, and a plurality of holders each having an eye forengagement with one leg of a filament loop and a straight portion forprotecting the next loop against contact with the structure by whichsaid holders are supported.

5. The combination of a central pedestal, a plurality of filament loopsdisposed about said pedestal, a group of refractory holders equal innumber to said loops each engaging with one leg of a filament loop, anda second group of holders of the same number spaced apart from the firstgroup in the longitudinal direction of said pedestal engaging with theother legs of said loops.

6. The combination of a pedestal, a plurality of filament loops disposedabout said pedestal, and a plurality of holders tangentially arrangedwith respect to said pedestal and having eyes for engagement with saidfilament loops.

7. The combination of a central pedestal, a plurality of filament loopsdisposed about said pedestal, a plurality of refractory holders carriedby said pedestal and each having an eye engaging with one leg of afilament loop, said holders serving as barriers to limit movement ofother filament legs in a radial direction with reference to the group offilaments.

8. In an incandescent lamp, the combination of a plurality of filamentloops and a plurality of refractory holders therefor arranged to form asubstantially closed barrier and limit movement of said filament loops.

9. In an incandescent lamp, the combination of a plurality of filamentloops and re- 1 fractory means engaging some of the legs of said loopsand guarding the unengaged logs from contact with the structure carryingsaid refractory means.

10. In an incandescent lamp, the combination of a plurality of filamentloops, and a plurality of groups of supports for said filament loops,each group comprising one support for each filament loop formed forengagement witlra leg thereof and the engaging portions of the supportsof one group being in staggered relation with those of an adjacentgroup.

11. The combination with a group of filament legs of refractorysupporting means engaging some of said legs and acting to limit movementof the other legs in a radial direction with reference to said group.

In witness whereof, I have hereunto set my hand this 21st-day ofFebruary, 1907.

LUDVIG GLASER.

lVitnesses HANS GELLAS, Gnsmv Nnr'rmns.

